Drill head



Oct. 5 1926. 1,602,322

T. l.. BELL DRILL HEAD Filed Dc. A12, 1925 -17 O Z f 5f' /f INVENTOR ATTORNEY Unire sr THOMAS LESTER BELL,

A ic

or GAnTI-r, KENTUCKY.

DRILL HEAD.

Application led December This invention relates to drill heads, and contemplates a novel construction and arrangement o f parts wherein thedrill bits can be quickly and conveniently associated with or removed fron the head as the occasion may require, the invention residing in the construction, combination and arrangement of parts as claimed.-

y In the drawings forming part of this a plication, like numerals of reference in icate similar parts throughout the several v views, and wherein:

Figure 1 is a view in elevation of the drill head complete.

Figure 2 isn a sectional vieu7 on line 2- of Figure 1.

Figure 3 is a fragmentary view of the shaft.

Figure 4 is an end elevation thereof.

Referring to the drawings in detail, 10 indicates a sleeve which may be constructed from any suitable material and vary in size without departing from the inventive idea, and adapted to receive the shaft 11 of a 25 length substantially equal to that of the sleeve 10. The shaft is provided with a. flange 12 at one end thereof and adapted to bear aga-inst the adjacent end of the sleeve 10 when the parts are associated, as shown in Figures 1 and 2. The shaft is provided with a plurality of spaced longitudinal grooves, arranged in pairs, one ypair of grooves being indicated at 13, while the other pair of grooves are indicated at 14.

The grooves of each pair are diametrically opposite each other, and as clearly illustrated in Figure 2 the grooves 13 are comparatively short when considered with relation to the length'of the grooves 14. All of the grooves, however, open at one end of the shaft, and are -in a linewith notches 15 formed in the flange 12, as shown in Figure 4. Each groove is formed at its inner end to provide a rounded portion 16 to accommodate the head 17 of a drill bit .18, there being one of these bits arranged in each groove.

The bits arranged in the grooves 14 extendan appreciable distance beyond the outer ends of the bits arranged in the grooves 13.

The longer bits 18 constitute leaders for the shorter bits or reamers, while. the sleeve 10 `is provided with a spiral liange 19' for re-4 moving the dust ory the like from the hole being bored by the tool, the invention being- 12, 1925. serial No. 75,069.

primarily intended for use by coal miners,

although its general application is contemcharacterof drill now generally employed.

While it is believed that from the foregoing description the nature and advantages of the invention will be readily apparent, I desire to have it understood that I do not limit myself to what is herein shown and described, and that such changes may be made when desired as fall within thevscope of what is claimed.

Having thus described the invention, what is claimed as new, is

1. In combination, a sleeve, a shaft arranged therein and having spaced longitudinal grooves, a Bange on one end of the shaft and adapted to bear against the adjacent end of the sleeve, andhaving notches in a line with said grooves, drill bits arranged in saidgroove and clamped between the shaft and-sleeve,and means for securing the sleeve and shaft together.

2. Incombination', a shaft having spaced longitudinal grooves therein, a flange at one end of the shaft and having 'notches in a line with said grooves, drill bits arranged in said grooves and passed through said notches, a sleeve surrounding said shaft and holding said bits associated therewith, means for holding thesleeve and shaft together, a spiralflange surrounding said sleeve, and

said bits being of relatively different lengths.

3. In combination, -a shaft having spaced longitudinal' slots arranged4 vin pairs, Vthe slots of one pair being shorter than the slots of the other pair, bits ofV relatively. diferer lengths arranged in the respective slots, a

sleeve surrounding the shaft "and holding the bits associated with the-latter, saidrshaft having a slot at one end, and 'a bolt passed through the. slot and connecting the shaft and sleeve together for the purpose specified. In testimony whereof I affix my si ature. THOMAS LESTER Bn LL.l

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